Signal relay device



FIG. 1. is a front perspective view of the front, right, and bottom sides of a signal relay device showing our new design;

FIG. 2. is a rear perspective view of the rear, left, and top sides thereof;

FIG. 3. is a front view thereof;

FIG. 4. is a rear view thereof;

FIG. 5. is a top plan view thereof;

FIG. 6. is a bottom plan view thereof;

FIG. 7. is a right side view thereof; and,

FIG. 8. is a left side view thereof.

The broken lines in the drawings illustrate portions of the signal relay device that form no part of the claimed design. 

CLAIM The ornamental design for a signal relay device, as shown and described. 